The Baltimore/Washington forecast office is calling for less than an inch of snow across northern Baltimore County and much of Frederick, Carroll and Harford counties, with 1-2 inches possible in areas closest to the Pennsylvania line. Check the office's snow forecast map for updates.

Precipitation, whether rain or snow, is expected to start after midnight Tuesday and continue on and off through early Tuesday afternoon.

The weather service's hydrometeorological forecasters expect the system to bring mostly light rain to the mid-Atlantic, with light snow along its northern edge from Ohio to New Jersey, according to forecast discussions. No precipitation amounts are expected to be excessive.

Most of Maryland has a less than 10 percent chance of significant snowfall, while to our northeast the chances are between 10 and 40 percent of at least 4 inches of snow, according to the forecasters.

The forecast would do nothing to start the official season snow tally for the year here. Only rain is expected at BWI Marshall Airport, the point of record for Baltimore. November snow has been rare in recent years, with only between a trace and half an inch in three out of the past 10 years.

Foot's Forecast predicts falling snowflakes across the major cities of the northeast Interstate 95 corridor, but likely only at the very start or end of the weather event. Only about a quarter of an inch of moisture is expected out of the system, according to Foot's forecasters.

Historic flooding and the coldest temperatures in decades made weather headlines in Baltimore in 2014. Rainfall records were set in April and August, and after a frigid winter, the summer was comfortable and fall cool. The year is expected to be the coolest and wettest here in years.